نویسندگان

1 دانشگاه علم و صنعت ایران

2 دانشگاه شهید بخشتی - برق و کامپیوتر

چکیده

هدف از این مقاله، طراحی یک زیرسیستم کنترل وضعیت تحمل‌پذیر عیب است که قابلیت‌های تشخیص، شناسایی و اصلاح عیب را در این زیرسیستم ایجاد می‌کند. در این راستا، استفاده از روش تاکاگی- سوگنو برای مدل‌سازی دقیق دینامیک غیرخطی ماهواره مدنظر قرار گرفته است، که بر اساس آن می‌توان از قابلیت رؤیتگرهای تطبیقی خطی برای دینامیک ‌غیر خطی ماهواره بهره‌گیری کرد. در رؤیتگر تطبیقی طراحی شده، عیب حادث شونده در چرخ‌های عکس‌العملی بر اساس یک الگوریتم تطبیقی، تخمین زده شده که امکان تشخیص و شناسایی عیب در عملگرها را ایجاد می‌کند. ایدة مورد استفاده در بخش اصلاح عیب، استفاده از یک قانون کنترل خطی‌سازی فیدبک پسگام است که از عیب تخمین زده شده توسط رؤیتگر تطبیقی به‌عنوان بخش جبران‌ساز در این الگوریتم بهره‌گیری شده است. بر این اساس، محدود ماندن خطای کنترل وضعیت به‌رغم بروز عیب در عملگرها تضمین می‌شود. در انتها با انجام شبیه‌سازی، الگوریتم‌هایطراحی شده ارزیابی می‌شوند.

کلیدواژه‌ها

عنوان مقاله [English]

Design of Fault Detection, Identification and Recovery Algorithms for a 3-Axis Stabilized Satellite

نویسندگان [English]

  • H. Bolandi 1
  • M. Haghparast
  • M. Abedi 2

چکیده [English]

A Fault Tolerant attitude control system has been designed in this paper, which provides abilities of fault detection, identification and recovery. For this purpose, nonlinear dynamics of satellite is modeled based on Takagi-Sugeno method, which enables us to extend advantages of linear adaptive observer for nonlinear dynamics of satellite. In the designed adaptive observer, occurrence of fault in satellite reaction wheels are estimated based on an adaptive law which provides abilities of fault detection and identification in these actuators. Also, a back stepping feedback linearization control law has been applied for recovery which uses estimated fault term provided by adaptive observer as a compensation term in control law. So, bounded error of attitude control has been guaranteed even in faulty conditions. Finally, fault detection, identification and recovery algorithms have been verified by simulation results.

کلیدواژه‌ها [English]

  • Satellite attitude control subsystem
  • Fault detection and identification
  • Adaptive observer
  • Takagi
  • sugeno model
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